Concentrating table and method



v. F. NEWMAN AND N. w. LooM|s. coNcENTRATlNG TABLE ANn METHQD. APPLIC'AI'ION FILED NOV. 21?. 1920.

v. F. NEWMAN AND M. w. Loo-Nus. CONCENTRATING TABLE AND METHOD. APPLICATION-FILED NOV. 2.3, V920.

Patented July 25, 1922.

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ATTORNEYS wall or vertical member 24 of casting 22. The arrangement is such that as the cam by engaging the member 21 moves the table in one direction the spring 23 is stressed so that it may re-act when the cam 19l cams olf the upperend of the member, 2l.y Thus, the lcam moves the table in one direction while the spring- 23 returns it after release by the cam.

The casting 24 may be let into a longitudinal beam 25 at the under side of the table l0, the opposite end of said beam constituting a bumper bar; for the purpose it is provided with a bumper head 26 and narrowed as at 27- adjacent to said head, a bumper block 28 being provided in front of the head 26 to receive the impact of the bumper bar or beam. Suitable guide means is provided for the reciprocating movement of the bumper beam, there being shown a guide block 29 spaced from the standard 13a, suiiicient to accommodate said beam.

lThe table l0 operates to concentrate and stratify the material by the jarring of the table and without the use of Washing water and afclarifier is employed beyond the nar row end of the table for washing off the middlings from the stratified material. The triangular form of the effective area of the table may be given to it by providing a barrier or rail 30 at one side parallel with the axisof the table or approximately so while the opposite side of the table has an oblique rail or equivalent barrier 3l and there may be employed a corner strip 32 on the 'table adjacent to the oblique rail 31.

The concentrating riffles 33 are disposed *oblique to the parallel rail 30 of the table,

an effective angle being 25o to said rail and to the longitudinal axis of the table, the oblique barrier 31 having a corresponding angle to the axis. Thus the ritlies 33 are at an angle of approximately 50 tothe oblique side of. the table and are so disposed as to extend from points along the transverse feed end of the table and then along `the parallel rail 30, said riflies being disposed generally toward the oblique barrier The angle of 50c applies to the main ritles 33 distributed over the major portion of the table area; adjacent t-o the narrowed end of the table advantageously, the rifiies (33N have a decreasing` angle, being approxi mately 40 in practice. The ritlles 33 terminate short of the oblique side 3l and-thereby a longitudinal passage 34 isprovided on the table between said oblique side 3l. and the ends of the rifiies along which passage the stratified material after leaving the rifiles 33fis advanced toward the narrow end of the triangular table. Riiiies 33, 33n are of uuiform height.

The tailings are discharged at Athe straight side of the table from approximately the transverse center of the table to the naring area presents a surface continuous with that of` the concentrating table and it extends laterally beyond the straight side 30 of the table, there being providedan incline 35"L for the tailings at the rear of the laterally extending portion of the clarier 36 and coterminous with the incline which is parallel with the straight side 30. Between the feed end of the table and the tailings discharge 35 the straight side 30 rises to a height that will prevent the escape of tailings until their discharge is permitted at a point where the separation of the values has progressed to the desired extent.

Bytlie described arrangement the material will'become stratified betweenthe rifiies 33 with the fine concentrates at the bottom as at a, the coarser concentrates in a stratum Z), next above, the middlings next 'above the coarse concentrates as indicated at c, and the tailings d at the top, all as conventionally indicated in Figure 4, the tailings moving forwardly and laterally in tbe form of a gent-le surface wave and themiddlings having similarly a wave form in advancing; the middlings, however, moving in a resultant direction which will deliver them beyond the tailings discharges 35, 35 so that they may be washed off at the clarifier 36.

The accumulating accretions discharged by successive concentrating riiiles 33 to the oblique passage 34, together with the vibration of the table, causes the stratified material to be progressed toward the narrowing discharge end of the table with a gentle but comparatively rapid movementl without disturbance of the stratification. Also, the angular disposition of the concentrating riiiies 33 relatively to the oblique side or rail 3l and to the oblique passage ,34, is such as to cause a discharge from the riffles to said passage gently and without disturbance of the stratiticationefi'ected in thesettling of the materials between the riffles, the settling progressing along' said oblique passage.

lt will be observed that the riiiies 33 are sho-wnbevelled at the discharge side, while the receiving side or that` side toward the oblique rail y3l. isiperpendicgular1 to the table surface or approximately so. Preferably. the beveling is ou transverse lines presenting a compound curve. The described form and uniform height of the rifiles 33 together' with the angular positions of the riliies factors in bringing out the stratification in causing the tailings forming the top stratum of the separated material to move forwardly and laterally in the form of a gentle wave and making for the maximum tendency of the materials to settle in strata` with the ne values at the bottom as referred to. 1n this way the fine values are-saved to the maxi.- mum extenty while the tailings are effective-ly carried forwardly and laterally without the employment of washing water which is recognized as tending to carry off the finer particles of the values.

ln the movement of the materials between the rifiies 33 and along the passage 34 the middlings are finally disposed at the top as the stratified material reaches the clarifier 36. The clarifier has a. discharge 37 at the end and it is provided on the surface with rilfles 38 and said riffles are disposed in the general direction of the discharge 3'? for the concentrates and at a gradually less angle from that side adjacent to the oblique rail 31 to the opposite side.` The middlings at the clarifier are washed off with water supplied at the side adjacent to the rail 3l, there being indicated for thepurpose a. supply pipe 39 adapted to be connected with a source of water supply and delivering to a distributing box 4l() from which a plurality of oblique outlets el discharge rearwardly or in the general direction of the oli-coming concentrates into a reservoir 4:2 extending longitudinally of the clarifier7 the water finally escaping over a wall 43 constituting a break-water to prevent a too violent movement of the water against the materi al. The water fiowing over the wall 43 transversely of the clarifier' surface and over the successive riffles 38 gently washes off the in iddlings which pass over an incline 4:5 at the dis-L charge side of theclarifier. 'The iniddlings in practice may be collected in any suitable manner to be aga-in subjected to the concentrating process.

The material is fed to the concentrating tab-le adjacent to the oblique side so that it will be required to travel forwardly over the table a considerable*distance before the lateral movement of material causes the tail ings to discharge. We have shown a box-like structure 46 and a feed pipe 47, the surface r of said receiver Lf6 being continuous with the surface ofthe table 10. ln practice, the table preferably is built up of narrow boards or strips 10d over which a coveringl0b of oilcloth or the like on which the concentrating .riffies 30 are secured. 7 1t will be observed that there is an unriffled feed-distributingarea 10 on the table of general triangular form between fthe riliies 33 and the feed device46. f

Certain of those riflies 33a adj acentto the narrowed end of the table termin-atc short of the others, to increase the effective width of the longitudinal oblique passage adjacent tothe point of delivery of the washing water. Y

We would state in conclusion that. while the illustra-ted example constitutes a practical embodiment of our invention, we do not limit ourselves strictly to the mechanical. details herein illustrated, since manifestly the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

Having thus described our invention, we claim:

1. 1n a concentrating apparatus, means to stratify the material without wash water. and clarifying means by which the stratified material is received from the first means 2. A concentrating apparatus including a hydraulic settlingl means to concentrate and. stratify the material, and clarifying means to which the stratified material is fed by the rstmeans,` said second mentioned means comprisingmeans to direct water to the clarifier to wash off the upper stratum ofthe material. l

3. A concentrating apparatus including a hydraulic concentrator for stratifying the material with the fines at the bottom and the middlings at the surface. said hydraulic concentrator having a tailings discharge; and means to wash the upper stratum of middlings from the stratified material.

4. .A concentrating apparatus including a hydraulic concentrator means for stratifying the material with the fines at the bottom and the middlings at the surface, said hydraulic concentrator having a tailings discharge: and means to wash the upper stratum of middlings from the stratified material.. said. first-mentioned means constituting the feed for delivering the stratified material to the second-mentioned means.

5. concentrating table one end of which constitutes the concentrates discharge and having feed means confined to the opposite end of the table from the concentrates dis charge, said table having that side opposite the tailings discharge disposed obliquely and having a narrow passage approximately of uniform width. extending along said opposite side to direct. received material longiu t'udinally toward the concentrates discharge end from said end feed means, riffles on said table obliquely disposed for discharging material .to said passage substantially alongthe complete length of said oblique side. said passage affording unobstructed travel for the material toward the concentrates discharge, the table along said passage being free from wash water and feed means.

6. A concentrating table having an unwashed concentrating surface presenting a barrier along a side of the table from the feed end to a point ladjacent to the opposite end as well as abarrier along the opposite side of the table from a point adjacent the feed end but extending a less distance than the first-mentioned barrier, there being a tailings discharge between saidsecond mentioned barrier and that end of the table opposite the feed end; together with concentrating riffles extending from points along a transverse line, adjacent the feed end toward the first-mentioned barrier7 and other concentrating riflilcs extending from points along the second-mentioned barrier toward the first-mentioned barrier, there being a longitudinal passage for the material between the terminalsof said riffles and the first-mentioned barrier.

15. A bumping hydraulic concentrating table for concentrating without the use of wash water, one end being the feed end and the opposite end theconcentrates discharge, said table presenting generally a triangular form narrowing toward said discharge end and affording a longitudinal passage` for the material oblique to the longitudinal axis of the table and substantially from end to end thereof, and concentrating riflles on the table oblique to said passage and delivering the concentrated material to` Y which the rifflesr deliver.l certain of the -riflles the latter.

16. A concentrating apparatus including a hydraulic settling table having means for stratifying the material without the use of wash water, and a water delivery means between the concentrating table and the discharge for the concentrates to wash offy the middlings from the stratified material.

17. A concentrating apparatus including va hydraulic settling table for stratifying the material without the use of wash water, and a clarifier between the concentrating table and the discharge for the concentrates, said clarier including water delivering `means yata side of the clarifier to direct water theretudinal axis of the table and a longitudinal side passage along which the material mayprogressl from said concentrating riifles to the narrowed end of the table, and raised riflies'i'on Said clarifying area anddisposed generally longitudinally ofsaid area; together with a water supply for delivering water to the clarifying area at that side of the table at which said passage is disposed.

19. A concentrating apparatus including a hydraulic settling table having raised stratifying rifllcs and a clarifier to which the stratified material is delivered fromsaidv table,`said clarifierincluding a water delivery pipe at a side of the table to wash od the middlings from the stratified material and a distributing reservoir having an overflow wall constituting a brealrwater, there being a discharge for wash material at the opposite side of the clarifying area.

f 20. A concentrating apparatus including a rillied hydraulic settling table narrowed toward the end opposite the feed end and having a tailings discharge along one side kof the table7 and a riflied clarifying area ibetween the narrowed endof the concentrating table and the discharge of the concentrates;

adjacent to the discharge end of Said passage being of decreased length to afford a widening of the passage; together with means to supply water adjacent said pas-1- sage and adjacent to said rifllesV of reduced length. f 1

22. A concentrating table including` a barn rier oblique to the longitudinal axis of the table along a side of the table. oblique strati#v fying riflies extending from points alonga transverse lineadjacent to the feed end of the table and terminating short of said barrier to crowd the stratified material against said barrier as well as riffles ex tending from points along the opposite side of the table from said barrierand terminating` short of the latter; together with feed means disposed between the first-mentioned riflles and said barrier. i n

23. A concentrating apparatus including a hydraulic settling table having means to stratify the material and narrowed toward the discharge end, a clarifying area between the narrowed end of said table and the discharge for the concentrates to which clarifying area the stratified material vis delivered, said clarifying area presenting a surface continuous with the surface of said concentrating table, and means to supply water to the clarifying area at aside thereof for washing off the surface stratum of the stratified material. f

` 24E. A riiied concentrating'table narrowed toward that end constituting the discharge for the concentrates and having a longitudinal passage adjacent to that side of the table opposite the side over which the tailings discharge and therefore remote from said tailings discharge, feed means confined to that end of the table opposite the coni centrates discharge, the table being Without feed means along said passage, and an un- Washed riffled surface extending over substantially the complete table except said passage, the rilies being oblique to discharge to said passage.

25. A concentrating' table having a tai1- ings discharge along one side, one end of the table constituting the discharge for concentrates, feed means confined to that end of the table opposite the said discharge, the side of the table to which said passage is adjacent being Without feed means and Without Washavater supply means, said table having a" longitudinal passage along and adjacent said opposite side, and having a main area provided Withraised stratifying riiiies oblique to said passage and directing material to said passage, said riffled area being narrower toward the discharge end of the table to cause the tailings to be crowded to and over said tailings discharge, a second rifiied area beyond the main riflled area and beyond said tailings discharge and. positioned to receive the stratified material from said narrowed end of the table', and means beyond the main riiiied area and beyond the tailings discharge to supply Wash Water for Washing off the middlings from the stratified material of said second riflied area.

26. A concentrating table having feed means confined to that end of the table opposite the discharge end, said table presenting a longitudinal stratifying passage extending from the feed end along the side of the table opposite the tailings discharge, riiiies on said table at an angle to direct the material to said passage, the table being free of feed means along said passage and free of Wash-Water supply means to leave the material progressing along said passage undisturbed by a cross feed of material or by Washing Water.

27. A concentrating table having feed means confined to that end of the table opposits the discharge end, said table presenti ing a longitudinal stratifying passage extending from the feed end along the side of the table oppositethe tailings discharge,

rillies on said table at an angle to direct the material to said passage, the table being free of feed means along .said passage and freeof Wash-Water supply means to leave the material'progressing'along said passage undisturbed by a cross feed ofm-aterial or by Washing Water; together with a rilfled clarifying area beyond said passage between tailings discharge into which passage the i material from said ril'lies is crowded along which passage the material may progress and stratify, feed means solely at that end of the table opposite the concentrates dis charge, the table being free of feed means and free of Water supply means along said passage, thereby leavingv the material moving along said passage undisturbed by cross feed or Wash Water.

29; A concentrating table having an un- Washed riliied concentrating surface presenting a longitudinal barrier at a side of the table opposite the tailings discharge, a longitudinal passage along said opposite sides into which the material from the rifiies is directed, and feed means at thefend of the table opposite the discharge for theiconcentrates and adjacent to the side of the table `havingsaid passage, there `being an unriflied distributing area adjacentto therear end of said passage and between the feed means and the riifles.

30.` A concentrating table having a tailings discharge Lat a sidethereof, and rillies rising `to their greatest vertical dimension at the side opposite the tailings discharge and presenting vtransversely a compound curve at the side toward the tailings discharge.

3l. In a concentrating method; producing a stratification of the concentrated material by hydraulic settling and Washing ofl:I the surface material from the stratified inaterial.

32. In a4 concentrating method, producing a stratification of the `material with `the middlings at the surface, and the tailings eliminated and then Washing off' the middlings.

33. In a concentrating method, producing a stratification of Wet ground material,` and eliminationy of tailings therefrom by sub-v jecting the material to a jarring action on av concentrating table in the absence of Wash water, and then Washing off the top'stratum.

34. In a concentrating method, the steps of stratifying Without Wash Water on a concentrating table, the concentrates of Wet ground material, While causing the stratified material tol progress forwardly onto anarrow area thereof to cause the tailings to be crowded olf, and 'Washingyofl" the:` top stratum of the' stratified concentrates.

35,' In amel/hed of concentrating ores on a riiHed table, tlie steps of feeding material to the tableo giving such movements to the material over the ril'Hed surface So as to cause stratification oi the material to take place between the rilles, discharging the stratified material to an unril'lled restricted area and giving movement to the material along said restricted unriiied area in a manner to effect pregressive stratification.

36. ln a method of concentrating ores on a riflied table, the steps of feeding material to the table, giving such movements to the material over the ritlied surface so as to cause stratication of the material to take place between the riiiie's? discharging the stratified material to an 'unriiiled restricted area, imparting movement to the material along said restricted unriiiied area in a manner t0 further stratify the material, with the middlings forming the upper stratum, and then washing 0H said upper stratum from the stratum beneath.

VICTOR F. NEW/*MMX MERTON W. LOOMLS. 

